The video ends with a slide announcing "Niko's (sic) story coming August 30, 2016," and a plug for the documentary, Vaxxed: From Cover-Up to Catastrophe.

LaHood screened the documentary at a local movie theater, the San Antonio Express-News reported, citing a source invited to the presentation.

According to The Washington Post,the documentary is directed by Andrew Wakefield, a former British surgeon who moved to Texas after being stripped of his medical license for lying in a study that claimed the measles, mumps and rubella vaccine caused autism and digestive problems.

LaHood told the Express-News on Monday that his "is not a politically correct opinion."

"We had a very normally developed child, meeting all the marks as a child — walking, eye contact ... and after his 18-month vaccination, we had a very different child," LaHood, who was elected in 2014, told the paper. "And our story is not alone. I mean, there's thousands of parents out there that have the same story. So my opinions are just my opinions as a daddy, as a husband who happens to be the DA."

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There is no scientific evidence linking vaccines to autism, and anti-vaccination critics have warned about a re-emergence of diseases such as measles and whooping cough.

State figures released this month show that the number of Texas parents refusing to have their children vaccinated for nonmedical reasons rose nearly 9 percent last year, the Houston Chronicle reported.

About 45,000 of the state's 5.5 million schoolchildren — about .84 percent — were not vaccinated due to "conscientious exemption." In 2003, the year Texas began allowing exemptions, that number was closer to 3,000.

The number of students in Dallas ISD who were not vaccinated for reasons of conscience or religious belief totals less than 1 percent, though some schools have higher rates.

Claire Cardona, Breaking News Producer. Claire joined The Dallas Morning News as an intern in 2012. She now writes about crime, other breaking news and the Dallas Zoo. She grew up in New Orleans and graduated with a journalism degree from the University of Texas at Austin.